To keep naturalized citizens from being President."
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Do you contend, then, that the framers where Naturalized Citizens of the United States of America? I would presume you do, otherwise...why the need for the "grandfather" clause?
It certainly couldn't be because they knew they were "Citizen's" (& not NBC). Right?
They knew they were not citizens from birth-- they couldn't have been, because there was no USA for them to be citizens of before 1776. A Natural Born Citizen is someone who was a citizen from the moment of his birth.